Spraying apparatus



April'lO, 1928.

C. G. SHIELDS SPRAYING APPARATUS Filed April 17. 1926 N UE 6 INITENTORBY 2 Z 5% A TTORNE Y Patented Apr. 10, 1928.

UNITED STATES CLARENCE G. SHIELDS, OF FLOREFFE, PENNSYLVANIA.

SPRAYING APPARATUS.

Application filed April 17, 1926. Serial No. 102,676.

My invention relates to spraying or atomizing apparatus for use inspraying liquids, such as, gasoline, paint, water, and 'oil, by means ofcompressed air.

One object of-my invention 15 to provide a device suitable for atomizingliquid fuels, such as gasoline, and supplying the same through a burnernozzle in a manner that IS more efiicient and safer than in the case ofdevices heretofore employed.

Another object of my invention is to provide an apparatus wherein a moreetlectlve mixture of liquid with air under pressure is secured than inthe case of devices of the prior art.

My apparatus, in addition to being su1table for supplying atomized fuel011 through a burner nozzle, can also be employed as a paint sprayer; todirect oil against leaf sprmgs for lubricating the same; coatingsurfaces with oil to protect them from the weather; to direct a spray ofgasoline, water, or other liquid against surfaces requiring cleansing,etc.

One form which my invention may take is shown in the accompanyingdrawing, wherein Fig. 1 is a side view of apparatus embodying myinvention; Fig. 2 is a long1tud1- nal sectional view, on an enlargedscale, of a portion of the apparatus of Fig. 1; and Fig. 3 is a viewtaken on the line 3-3 of Fi 2.

The apparatus, when in use, is connected through an air supply pipe 4with a source of air pressure (not shown), and to a source of liquidsupply through an inlet pipe 5 which communicates, preferably through ametal hose 6 with a source of liquid, such as gasoline, paint, oil, orwater. The hose 6 may be of any suitable length, so that no tank need becarried with the spraying apparatus.

The inlets 4 and 6 are controlledby suitable valves, 7 and 8respectively, and lead into a chambered block 9. A nipple or reducer 10that serves as an atomizing chamber has screw-threaded engagement withone end of the block 9, and has an opening in its side for the entry ofliquid from the pipe 5, as indicated by the arrows.

The air nozzle 11 has screw-threaded engagement with the inner end ofthe nipple 10, and is provided with a slot in one side so that air mayenter from the inlet 4 and pass into the nipple 10. Experiments showthat by providing an opening in the side of the air nozzle 11, andcausing the compressed air to flow radially into the nozzle and thenaxially thereof, a better vacuumizing and atomizing effect is produced,with less air pressure, than in the case of apassage straight throughthe nozzle.

Referring further to the said experiments, tests show that for a givenarrangement of apparatus 7 0 lbs. air pressure is required to spraygasoline, where an air nozzle having a straight axially extendingpassage is employed, while with an air nozzle, such as the nozzle 11,having an opening in its side, only 35 1b. air pressure is required tospray gasoline. For spraying heavier liquids, such as crude oil, paint,auto enamels and varnish, air pressures up to 90 lb. per square inchproved inefi'ective where the ordinary straight passage nozzles areemployed, but, with the structure shown in the drawing, pressures not inexcess of 90 lbs. per square inch were suificient to spray paint, etc.In spraying the heavier liquids it is also important to have the liquidconduit 5 connected to the spray chamber at a point close to the frontend of the air nozzle, because if it is placed too far rearwardly of theair nozzle, ordinary air pressures will be insufficient to draw in asupply of the liquid to be sprayed.

A spray pipe 12, is connected to the outer end of the ni ple 10, and aspray nozzle of any suitable orm may be connected thereto. In thedrawing, a burner nozzle 13 of a usual form is shown in place upon theend of the pipe 12, and a mixture of air and fuel oil may be suppliedthrough the pipe. Such mixture can be ignited at the nozzle and thedevice serve as a blow torch, it being customary to first heat thenozzle over a flame in order to facilitate the ignition of the atomizedfuel. The arrangement just described is particularly useful when used asa blow torch, for the reason that fuel oil may be employed instead ofgasoline, thus avoiding danger of explosions and reducing liability tofires. J

In utilizing the device to s ray oil, paint or water upon surfaces for te purpose of coating or cleansing the same, any suitable form of nozzleis substituted for the burner nozzle 13.

It will be understood that in use, the valve 8 is opened to the desireddegree, and that the control lever valve 7 is depressed to admit theentry of air pressure and that fluids other than those abovespecifically mentioned ma be utilized. v

he inlet pipes 5 and 6 may be cleared of one 1i uid previous to using adifl'erent 5 liquid, y the operator holding a finger over the outer endof the pipe 12 and opening the air valve, the pipe 6 being firstwithdrawn from the reservoir or other source of su ply. Z 10 I aim as myinventlonz Spra in apparatus comprising a chem-1 bered b 00 an airpressure conduit extend-- ing into said block at one ,-end, a spraychamber disposed within the block at the 15 other end and havingscrew-threaded conmouse nection with the wall of the latter-named end,so as to be removable therefrom, a spray pipe communicating with theforward end of said chamber, an air nozzle disposed within said blockand extending into the, other end of said chamber, and a liquid inletcommunicating with the said chamber at a point approximately mid-way ofits ends, through openings in t e side wall of said block and theadjacent. wall of the chamber, the air nozzle being supported by andremovable with the said spray chamber.

\ In testimony whereof I the said, CLARENCE G. SHIELDS have hereunto setmy hand.

CLARENCE G. SHIELDS.

